816613131429 has 12 divisors (see below), whose sum is σ = 1191231037932. Its totient is φ = 539018568000.

The previous prime is 816613131377. The next prime is 816613131437. The reversal of 816613131429 is 924131316618.

816613131429 is a `hidden beast` number, since 8 + 1 + 6 + 613 + 1 + 3 + 1 + 4 + 29 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 507938439204 + 308674692225 = 712698^2 + 555585^2 .

It is not a de Polignac number, because 816613131429 - 2¹³ = 816613123237 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (816613131479) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 449181232 + ... + 449183049.

It is an arithmetic number, because the mean of its divisors is an integer number (99269253161).

Almost surely, 2^816613131429 is an apocalyptic number.

It is an amenable number.

816613131429 is a deficient number, since it is larger than the sum of its proper divisors (374617906503).

816613131429 is a wasteful number, since it uses less digits than its factorization.

816613131429 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 898364388 (or 898364385 counting only the distinct ones).

The product of its digits is 186624, while the sum is 45.

The spelling of 816613131429 in words is "eight hundred sixteen billion, six hundred thirteen million, one hundred thirty-one thousand, four hundred twenty-nine".